House Un-American Activities Committee (HUAC), Committee of the U.S. House of Representatives, established in 1938 under Martin Dies as chairman, that conducted investigations through the 1940s and ’50s into alleged communist activities. Those investigated included many artists and entertainers, including the Hollywood Ten, Elia Kazan, Pete Seeger, Bertolt Brecht, and Arthur Miller. Richard Nixon was an active member in the late 1940s, and the committee’s most celebrated case was perhaps that of Alger Hiss. Its actions resulted in several contempt-of-Congress convictions and the blacklisting of many who refused to answer its questions. Highly controversial for its tactics, it was criticized for violating First Amendment rights. Its influence had waned by the 1960s; in 1969 it was renamed the Internal Security Committee, and in 1975 it was dissolved.

House Un-American Activities Committee hearings, 1947Ronald W. Reagan as a witness at the House Un-American Activities Committee hearings on communists in Hollywood, 1947.Stock footage courtesy The WPA Film Library